Sediment Concentrations In Fluid Mud Layers

When mud flocs settle on the bed, they form a space-filling network structure, referred to as a gel, and a measurable strength builds up. The concentration at which this happens is referred to as the gelling point. The volumetric concentration 0f then becomes unity, see Equation (12.4). If we assume that the flocculation model is also valid for these conditions, we can establish the gelling concentration cgel for equilibrium conditions (dDf /dt = 0) as a function of shear rate parameter G for various values of the fractal dimension nf from the relation (12.4) and the Lagrangian flocculation model (12.7). We assume that Dp ^ Df, and that the sediment concentration is constant, yielding

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